Pressure-operated means for puncturing closure diaphragms



I Oct. 13, 1931. 5, l ALLEN ET L 1,827,723

PRESSURE OPERATED MEANS FOR PUNCTURING CLOSURE DIAPHRAGMS Filed July 27,1927 2 Sheets-Sheet l Oct. 13, 1931. s. E. ALLEN ET AL 1,827,723

PRESSURE OPERATED MEANS FOR PUNCTURING CLOSURE DIAPHRAGMS Filed July 27,1927 2 Sheets-Sheet 2 Patented Oct. 13, 1931 UNITED; STATES PATENT,OFFICE SOOTT E. ALLEN AND QZRO-N. WISWELL, OF LOS ANGEL, CALIFORNIA,ASSIGNOBS, BY

MESNE ASSIGNMENTS, TO C-O-TWO FIRE EQUIPITIENT COMPANY, OF CALIFORNIA, ACORPORATION 01 CALIFORNIA LOS enemas,

PRESSURE-OPERATED MEANS FOR PI INC'IURING CLOSURE DIAPHRAGHS Applicationfiled m 27, 1927. Serial No. 208,795.

This invention relates to apparatus for releasing a fluid under pressurefrom a 'recep tacle. The invention is particularly useful 1 in fireextinguishing apparatus in which inert gas such as carbon dioxide isreleased from receptacles and delivered to burning parts forextinguishing them. In the description which follows, our invention willbe described in connection with fire extinguishing apparatus, but itshould be understood that the invention may be utilized in other artsand therefore we do not'wish to limit ourselves to the particular usedisclosed herein.

The invention provides an improved apparatus whereby the dischargeopening of a receptacle containing. a fluid under pressure may be openedfor delivering this fluid to its place of application. I

One of the objects of the invention is to provide a fluid releasingapparatus which is operated by a fluid under pressure.

Another object of the invention is to provide an apparatus of thischaracter in which fluid under pressure may be released from one or morereceptacles by the action of a fluid under pressure.

" A still further object of the invention is to provide an apparatus ofthe character mentioned in which the fluid released from one 0receptacle-will release the fluid from another receptacle. 1

A still further object of the invention is to rovide an apparatus of thecharacter de scribed in which the supply of operating fluid to theoperable parts for releasing the fluid under pressure is automaticallyor manually controlled.

Other objectsand advanta es of the invention"will be apparent from t efollowing detailed description of a typical form and application of theinvention throu hout which description referenceis had to t e drawingsin which we illustrate our invention:

Fi 1 is a view illustrating the apparatus shown in section. t Fig. 2 isan enlarged vertical section of the operating fluid supply means.

Fig. 3 is a section taken on the line 33 of to Fig. 2.

provided by the invention, certain parts being openings 33 formed inwalls 34, the lower Fig. fl; is a section taken on the line 4-4; of Fig.2.;

Referring to the drawings in detail and particularly Fig. 1, the numeral11 designates a receptacle which in this application is in the form ofthe ordinary bottle 12 in which carbon dioxide gas is supplied to themarket. The bottles 12 employed to handle carbon dioxide gas areprovided with cylindrical threaded portions 13 to receive a cap or head.Projecting upward from the cylindrical threaded portions are projections14 and formed through the projections 14 are discharge openings 15.Theouter ends of the projections 14 are sealed by closure members in theform of discs or diaphragms 17 retained in place by caps 18. It isunderstood that other means for closing the discharge openings 15 may beprovided if desired.

Heads or bodies 20 are screwed onto the threaded portions 13, the bodies20 having internally threaded portions 21 which engage the threadedportions 13. The bodies 20 provide or form chambers 23 which enclose theprojections 14, the closure members 17 and the caps 18. The chambers 23are connected to delivery means-in the form of a delivery pipe 24. Thepipe 24 is provided with check valves- 25 adjacent to the oints where itconnects to the chambers 23 or reventing flow from the pipe into thechain rs 23 but allowing free flow from the chambers 23 into the pipe24. The delivery pipe 24 is ada ted to extend to any place where it isdesired to appl the carbon dioxide. The upper parts 0 the bodies 20 arein the form of cyllnders 27, the upper ends of these cylinders 27 beingclosed by covers 28. Placed in the cylinders 27 are pistons 29 which are0 rable therein. The pistons 29 are operatlvely connected with fluid'release'means or penetrating means in the form of plun ers 31. 1 Theplungers 31 extend upwardly t rough openin s 32 formed in the covers 28and downwar 1y through ends thereof extending into the chambers 23. Thelungers 31 are provided with flanges 36 whic engage the walls 34, thusdetermining the upper positions thereof. The lower ends of the plungers31 are provided with points 1 37 which, when the plungers are moveddown- ,ward intojthe positions indicated by dotted lines 39," penetratethe closure members and open the discharge openings 15. It should 5beunders'tood that the plungers '31 may be designed to operate othertypes of closure members and any alterations necessary to adapt theplungers to other closure means is within the scope of this invention.The upper ends-of the plungers 31 are provided with external knobs 39and compressed between the knobs 39-and the upper faces of the covers 28are compression springs which normally yieldingly hold the plungers inthe 1 ositions shown by full lines in the drawings. ormed through thewalls 34 around the openings 33 are pressure relief ducts 42 whichprevent a pressure from building up in the cylinders 26 below thepistons 29 prior to 20 actuation of the pistons and which allow fluidreleased from the bottles 12, when the discs 17 have been punctured, toact on the pistons 29 to move them up in the cylinders.

Connected to the upper parts of the cylin- 26 ders 27 above the istons29 is operating means in the form 0 an operating fluid line 46, Theoperating fluid llne 46 is provided with check valves 47 adjacent to thepoints of connection with the cylinders 27 for the so urpose ofpreventing a flow from the cyline'rs into the operating fluid line 46.The operatin fluid line 46 is connected with a source 0 fluid pressure.The operating fluid line 46 may extend to a compressor 48 adapted 85 tosupp'ly. fluid under pressure to the cylinders 27 or may be connected bya pipe 49- to an o erating fluid supply indicated in general ythenumeral 50.

This operating fluid supply 50 is shown 40 in the 'form 'of' a bottle orother receptacle 51 which contains a fluid under pressure, preferablythe same kind of fluid that is retained in the receptacle 11. Asillustrated in Figs. 2, 3 and 4 the receptacle 51 is 5 substantially thesame in form and construction as the receptacle 11 except that it issmaller. The receptacle 51 is provided with a threaded portion 51a fromwhich a projection 52 extends. The projection 52 has a 60 cap 53 whichsecures a closure member 54 in place, this closure member 54 beinadapted to close a discharge passage 55. body 56 is screwed onto thethreaded portion 51a, this body providing a chamber 58 to which the pipe49 is connected. The closure mem ber 54 is adapted to be penetrated by apenetrating means in the form of a plunger 60. This plunger 60 extendsthrough a cylinder 61 and is connected to a piston 62 operable to in thecylinder. The upper end of the plunger 60 has a plate 63, and compressedbetween theplate 63 and the cap 61a of the cylinder 61 is a spring 64which normally yieldingly v retains t e plunger in the position shown in(3 full lines in Fig. 2. The plunger 60 may and engages the plate 63.The lever 67 may be depressed by supplying the fluid under pressure tothe upper end of the cylinder 61 by means of a pipe 66 or by depressinga lever 67 which is pivoted at 68 to'the body 56 70 be operated"directly or by pulling upon a chain or cord 69. The plunger 60 may alsobe depressed by means of a weight 74 normally supported above the upperend of the plunger by a supporting means 75, this supporting meanshaving a hook .76 which engages an eye 77 of the weight 74. The hook maybe normally held in position to engage the eye'by means of a member 79having a fusible link 80 which member 79' is connected to an arm 81of'the supporting member 75. The weight 74 is released when the fusiblelink 80 is melted, this resulting from an unusually high temperature.The weight drops on the upper end of the plunger 60 and depresses it soas to penetrate the closure member 54.

Connected to each of the cylinders 27 and to the delivery pipe 24adjacent to each of the check valves 25 are by-pass means in the form ofby-pass pipes 86. One of the by-pass pipes 86 is provided with aconstriction 87, and the other of the by-pass pipes 86 is provided witha check valve 88 which prevents a-flow from one of the cylinders 27 tothe pipe 24.

The operatlon of the invention is as follows:

The closure members 17 are penetrated whenever a fluid under pressure issupplied to any one of the cylinders 27. This pressure is suppliedeither by the compressor 48 or by the operating fluid supply 50. Theoperating fluid supply 50 is released for operation either manually,-automatically or by fluid pressure. Either ofthese methods will operatethe plunger 60 to penetratethe closure member 54 and thus release anoperating fluid under pressure to the operating fluid line 46. Thisoperating fluid passes into the upper parts of the cylinders 27 andforces pistons 29 downward. The plungers 31 are moved downward intopositions indicated by dotted lines 39, penetrating the closure members17. Thisreleases the fluid under pressure into the chambers 23, thisfluid passing through the check valves 25 into the supply pipes .24. Thepressure relief ducts 42 are provided so that there will be noresistance to the downward movement of the pistons 29. When any one ofthe discharge openings 15 has been opened, fluid under pressure willalso pass through the by-pass pipes 86 and into the upper parts of thecylinders 27 When the pressure in the cylinders 27 exceeds that in theoperating fluid line 46 the check valves 47 will close, thus preventinga reverse flow therethrough. In the event that one of the pistons is notoperated by the operating fluid under pressure it will be ops erated bythe fluid from the delivery pipe 130 supplied to the cylinder thereofthrough the the purpose of allowing any operating fluid to pass into thepipe 24 when the pressure in the supply pipe 24 drops below the pressurein the operating fluid line 46.

From the foregoing description it will be seen that this inventionprovides fluid-operated means for releasing fluid under pressure fromone or more receptacles 11. The apparatus is capable of releasing thefluid under pressure from all of the receptacles 11 simultaneously byan'operating fluid line or by releasing fluid from one of thereceptacles and thereafter releasing the fluid from the other of thereceptacles by use of the first released fluid.

' Having described only a typical preferred form of our invention, we donot wish to limit ourselves to the specific details set forth but wishto reserve to ourselves any changes or variations that may appear tothose skilled in the art or fall within the scope of the followingclaims:

We claim as our invention:

1. In combination: a receptacle containing a fluid under pressure, andhaving a closure member for closing a discharge opening thereof;penetrating means adapted to penetrate said closure member conitructedto pro-' vide free discharge through said closure; means for deliveringan operating fluid under pressure to actuate said penetrating means tocause said penetrating means to penetrate said closure member: and meansfor prevent- "ing a reverse flow of the operatingfluid.

2. In combination: a receptacle containing a fluid under pressure, andhaving a closure member for closing a discharge opening thereof;penetrating means adapted to penetrate said closure member constructedto provide free discharge through said closure; means for delivering anoperating fluid under pressure for actuating said penetrating .means andcausing said penetrating means to penetrate said closure member; anoperating fluid receptacle; and means for releasing the operating fluidthereof into the means for delivering the operating fluid.

' 3. In combination: a receptacle containing alfluid' under pressure,and having a closure member for closing a discharge opening thereof;penetrating means adapted to penetrate said closure member constructedto provide free discharge through said closure;

means for delivering an operating fluid under pressure to cause saidpenetrating means to penetrate said closure member; an operating fluidreceptacle; means for releasing the operating fluid thereof into themeans for delivering the operating fluid; and meansfor preventing areverse flow of the operating uid.

4. In combination, a series of receptacles containing a fluid underpressure, each having a closure member for closin the discharge openingthereof; penetratlng means adapted to pene rate said closure members;cylinders; pistons associated with said penetrating means and in saidcylinders; means for delivering an operating fluid under pressure tosaid cylinders for moving said pistons, said pistons causing saidpenetrating means to penetrate said closure members; a delivery meansinto which said fluid is delivered when said fluid is released; andbypass means connected to said delivery means and each of saidcylinders.

5. In combination: receptacles containing a fluid under pressure, andhaving closure members for closing a discharge opening thereof;penetrating means adapted to penetrate said closure members; cylinders;pistons associated with said penetrating means and in said cylinders;operating means for delivering an operating fluid under pressure to saidcylinders for moving said pistons, said pistons causing said penetratingmeans to penetrate said closure members; an operating fluid receptacle;means for releasing the operating fluid thereof into said operatingmeans; a delivery means into which said fluidis delivered when saidfluid is released; andby-pass means connected to said delivery means andeach of said cylinders.

6. In combination: receptacles containing a fluid under pressure, andhaving closure members for closing the discharge openings thereof; fluidrelease means for opening said closure members; cylinders; pistonsassociated with said fluid release means and in said cylinders; meansfor delivering an operating fluid under pressure to said cylinders formoving said pistons, said pistons causing said fluid release means topenetrate said closure members, and a fluid connection between thecylinders whereby fluid under pressure released from one receptacleoperates to actuate the piston in another cylinder.

7. In combination: a series of receptacles containing a fluid underpressure, andhaving closure members for closing the discharge openingsthereof; fluid release means for opening said closure members:cylinders; pistons associated with said fluid release means and in saidcylinders; operating means for delivering an operating fluid underpressure to said cylinders for moving said pistons,

said pistons causing said fluid release means to penetrate said closuremembers; an op- III erating fluid rece tacle; means for releasing theoperating flllld thereof into said operating means; means for preventinga reverse flow of the operating fluid, .and a fluid confor moving saidpistons, said pistons causing said fluid release means to penetrate saidclosure members; a delivery means into which said fluid is deliveredwhen said fluid is released; and by-pass means connected to saiddelivery means and each of said cylinders.

9. In combination: a pair of receptacles containing a fluid underpressure,.and having closed discharge openings, fluid release means foropening said discharge openings;

cylinders; pistons operablein said cylinders,

. each of said pistons being adapted to operate one of said fluidrelease means; means for delivering operating fluid to operate saidfluid release means; delivery means into which said fluid is deliveredwhen said fluid is released; and by-pass means connecting said deliverymeans and each of the cylinders. 10. In combination a pair ofreceptacles containing a fluid under pressure, and havoperate one ofsaid fluid release means;

ing closed discharge openings, a fluid actuated meansfor each of saiddischarge openings'to open the same; means for delivering operatingfluid to operate said fluid actuated means; and delivery means intowhich said fluid is delivered when said fluid is.re-.'

leased; and by-pass means connecting said delivery means to each of saidfluid actuating means. I 11. In comblnation: a pair of receptaclescontaining a fillld under pressure, and eac having a closed discharge 0ening; fluid re-' lease means for opening sai discharge openings;cylinders; pistons operable in said cylinders, each of said pistonsbeing adapted to means for admitting operating fluid to the face of thepiston away from the fluid releasing means; delivery means into whichfluid is delivered when said fluid is released;

' by-pass means disposed between said delivery means and each of saidcylinders; and means for preventing a reverse flow through said deliverymeans.

12. A device for use in connection with a fluidcontainer having asealedoutlet, and

means for opening the seal, saidmeans being constructed to provide freedlscharge of the fluid through the opening and including a body formounting on the container and having a section forming a chamber torece1ve fluid from the container and a section 13. In combination, apair of receptacles holding fluid under pressure, control means inconnection with each receptacle for controlling the discharge of fluidtherefrom, and communicating means between the control means whereby thecontrol means in connection with one receptacle is operable to releasefluid from saidreceptacle. b pressure from the other receptacle, each 0said con- -trol means including a receptacle opening member and acylinder and piston device for operating said member.

14. In combination, a' pair of receptacles holding fluidunder pressure,fluid pressure actuated means in connection with each receptacle forcontrolling the discharge of fluid conduit into which the receptaclesdischarge,

fluid pressure actuated'means in connection with each receptacle forcontrolling the discharge of fluid therefrom, and fluid connectionsbetween the conduit and the fluid pressure actuated means conductingfluid from the conduit to said means to actuate them.

'16. In combination, a fluid container having an outlet opening, afrangible member closing the opening, and means for opening saidfrangible member, said means being constructed to provide free dischargeof the fluid h' through-said member and including a art to be attachedto the container inclu ing a cylinder, means for attaching said part tothe container, a piston operable in the cylinder, a cutteroperable bythe piston to rupture the frangible member, and means for supplyingfluid pressure to the cylinder for actuatmg the piston to move thecutter to rupture the frangible member.

17 In combination, a fluid container having an outlet opening, afrangible member closing the opening, and meansfor opening saidfrangible member, saidmeans being constructed to provide free dischargeof the flllld through said member and including a part to be attached tothe container includlng a cylinder, means for attaching said part to thecontainer, a piston operable in the cyhnder,

a cutter operable by the piston to rupture the frangible member, asource of fluid under pressure for operating the piston in the cylin- Vder, and a conduit for conducting fluid from said source to thecylinder. 7

18. In combination, a fluid container having an outlet opening, afrangible member closing the opening, and means for opening saidfrangible member, said means being con- 10 structed to provide freedischarge of the fluid through said member and including apart to beattached to the container including a cylinder, means for attaching saidpart to the container, a piston operable in the cylinder, a

1 cutter operable by the piston to rupture the frangible member, asource of fluid under pressure, a conduit for conducting fluid from saidsource of fluid to the cylinder, and control means for the fluid fromsaid source remotefrom the c linder.

19. The com ination of a container, a delivery connection, a chamberedcoupling in communication with the container and the deliveryconnection, a sealing disc interposed between the container and thedelivery connection, and means for opening said frangible member, saidmeans being constructed to provide freedischarge of fluid through saidmember and including a piston member hav- I I so ing a close working fitin the coupling memher and subject to pressure by which it may be driventoward the disc, a device carried by the piston and adapted to rupturethe disc m its forward movement with the piston, and

85 means. to prevent effective resistance to the operative movement ofthepiston.

20. In combination, a receptacle carrying v a medium under pressure, apenetrable closure member closin a discharge opening of r40 saidreceptacle, an means for opening said closure member, said means beingconstructed to provide free discharge of flu1d through i said member andincluding a cyllnder, a p1ston -in the cylinder, a penetrating meansadapted to be operated by the piston to pene- -trate the closure, andmeans or developing pressure in the cylinder for actuating the piston,the piston being confined m the cylmder in substantially gas tight relaton throughout operation o' the penetrating means. 1

- 21. In combination, a fluid'contamer having an outlet opening, afrangible member closing the opemng, a part to attached to thiscontainer inc uding a cy-hnder, means for attachin said part to thecontainer to form a cham r to receive fluid from the container when thecontainer'is open, an outlet conduit connected with said chamber, acheck valve in the outlet conduit to prevent flu1d entering the chamberfrom the conduit, a piston operable in the cylinder, a cutter operableby the piston to rupture the frangible i member, and means for supplymgfluid res- '5 sure to the outlet conduit and to the cylinder foractuating the piston to move the cutter to rupture the frangible member.

'22. In combination, a fluid container hav ing an outlet opening,a'frangible member closing the opening, a part to be attached to thecontainer including a cylinder, means for attaching said part to thecontainer toform a chamber to receive fluid from the container when thecontainer is open, an outlet conduit connected with said chamber, acheck valve in the outlet conduit to prevent fluid entering the chamberfrom the conduit, a piston operable in the cylinder, a cutter operableby the piston to rupture the frangible member, a source of fluid underpressure for operating the piston in the cylinder, a conduit forconducting fluid from said source to the cylinder and to said outletconduit.

23. In combination, a fluid container having an outlet opening, afrangible member closing the openin and means for opening the frangiblemem er, said means being constructed to provide free discharge of thefluid through said frangible member and including a part to be attachedto the container ineluding a cylinder, means for attachin said part tothe container, a piston opera le in the cylinder,a cutter operable bythe piston to rupture the frangible member, a source of fluid underpressure, a conduit for con- .5 ducting fluid from said source of fluidto the cylinder, and manual control means for the fluid from said sourceremote from the cylinder.

24. In combination, afluid delivery conduit, a pair of receptacles eachcarryin fireextingulshing fluid under pressure an connected in parallelto said conduit, closure means associated with each receptacle forcontrollin the discharge of the fire-extinguishinig uid therefrom intosaid conduit, means or opening one of the closure means, and meansoperable by pressure of the fluid thus released for opening the otherclosure means. 7

25. In combination, a pair of receptacles holding fire-extin ishingfluid under pres sure, each receptac e having only one opening, aclosure for each opening, means for opening the closure of one of saidreceptacles, and means controlled by the discharge of fluid from thesaid receptacle for opening the other closure, the latter closure beinga frangible member.

26. In combination, a pair of receptacles, a frangible closure means foreach receptacle for retaining fire-extinguishing fluid under pressuretherein, means for rupturing one of the frangible closure means topermit the discharge of fluid from a receptacle, and means operable bythe fluid thus discharged for rupturing the other frangible closuremeans.

27. In combination, a fluid delivery conduit having an outlet opening todischarge fluid, a pair of receptacles normally carrying afire-extinguishing fluid under presv receptacle,

sure, each receptacle being individually connected with the deliveryconduit to discharge fluid to the conduit for passage directly throughthe delivery conduit to the outlet opening thereof, a closure for eachreceptacle, means for opening the closure of one and means controlled byinitiation of the discharge of fluid from the said receptacle foropening the closure of the other receptacle.

28. In combination, a fluid delivery conduit having an outlet opening, apair of receptacles for normally holding fire-extinguishing fluid underpressure, each receptacle ving only one outlet connected to the deliveryconduit, so that fluid from each receiptacle discharges therefromdirectly into t e delivery conduit and passes directly through thedelivery conduit to the outlet opening thereof, a closure for eachreceptacle opening, means for opening the closure of one receptacle, andmeans controlled by pressure of the fluid-thus released for opening theother closure means.

29. In a gas control s stem, a fluid pressure container having aischarge fixture including a fixture body, a disc therein sealing theoutlet of said container into said body, a disc-clamping member, andmeans for opening said disc, said means being constructed to providefree discharge of the fluid through said disc and including apiercer-plunger in said fixture in combination with a casing connectedto said fixture, and a fluid pressure piston in said casing adapted todepress said plunger and thereby open said sealingdisc.

30. A as control system comprising in combination a pilot bottleprovided with a dischar e fixture having a disc and an asso.-

ciated isciercer' mounted thereon, a battery oftgas ottles each providedwith a dis charge xture having mounted thereon a disc and anassociateddisc piercing means comprising a piercer member and a fluid pressurecylinder having therein a piston operatively related to the piercer ofthat fixture, and ,piping connecting the discharge fixture of the pilotto all of said cylinders for fluid actuation of the piston in saidseveral cylinders by the pressure fluid of the pilot bottle, saidpiercing means being each constructed to rovide free discharge of fluidfrom the hottle associated therewith. 31. Apparatus of the kinddescribedcomprising a discharge manifold, a battery of 7 bottles containing fluidunder pressure and respectively closed by puncturable sealing discs andeach provided with a piercer-carrying fixture'adapted to conduct thepressure fluid to said manifold, in combination with a piercer-actuatinghead mounted on one of said, fixtures, fluid-pressure cylinders withpiercer-actuating pistons therein mounted pressure to the cylinder toand a connection between the means whereby the means in connection w1theither receptacle is operable to release fluid from said receptacle bypressure from the other receptacle, each of the controlling meansincluding a receptacle opening punch and a cylinder and piston devicefor operating the punch.

33. In combination, a primary receptacle carrying a fluid underpressure, primary fluid retaining means for retaining said fluid in saidreceptacle, a delivery means into which said fluid is delivered when itis released, a secondary receptacle carrying a fluid under pressure, asecondary fluid retaining means for retaining said fluid in saidsecondary receptacle, primary operating means for operating said primaryfluid retaining means in a manner to release the fluid retaining meansin a'manner to release the fluid from said primary receptacle, secondaryoperating means for operating said secondary fluid retaining means inorder to release the fluid from said secondary receptacle, and fluid.operated means for actuatin said secondary operating means, said fluioperated means being'operatively connected withsaid delivery means.

34. .A device for use in connection with a container carr 'ng fluidunder pressure and having a scale outlet 0' ning and means for openingthe seal, sai structed to provide free discharge of the fluid throughthe opening and includin a body for connection with the container orminga closed chamber communicating with the outlet opening and having a clmder part, an

outlet conduit connected wit the chamber of means being con-' the body,a pistonoperable in the cylinder of the bod a member operable by thepiston to open t e seal, and means for applying therein, the pistonbeing confined in the cglinder in substantially gas-ti ht relation troughout its operation of sai member. I

35., A device for opening a'fluid container, including an openingmember, means for operating the opening member to open the container,and means whereby fluidreleased from the container acts in a manner toinsure return of the opening memberto normal position.

actuate the PlStOIl 36. in combination, a pair of containers for fluidunder pressure, discharge control devices for the containers, and meansinterconnecting the control devices whereby fluid released from eitherone of the containers causes actuation of the control device of theother container, each of the control devices being adapted for initialoperation.

87. In combination a receptacle for carrying fire extinguishing mediumunder ressure and having an outlet opening, a rangible member closingthe opening, a part to be attached to the receptacle including achamber, means for attaching said part to the receptacle, an outletconduit connected with the chamber, a check valve to prevent fluidentering the chamber from the conduit, and means for opening saidfrangible memher, said means being constructed to provide a freedischarge of said medium through said opening and including a pistonoperable in the said part, means operable by the piston to rupture thefrangible member, and means for supplying fluid pressure to operate thepiston.

In testimony whereof, we have hereunto set our hands at Los Angeles,California, this 21st day of July, 1927.

SCOTT E. ALLEN. OZRO N. WISWELL.

